ww8: make sure we don't wrap around
ww8: make sure we don't wrap around

Change-Id: I667bb264f92024b72f230c2ddbba3887471345f2

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core